Valve



N. CURTIS.

Valve.

Patented Ot. 26, 1880.

N. PETERS. FMD

Iflivrrnn Srares Erreur Ormea.

NELSON CURTIS, OF NEWTON, MASSACHUSETTS.

VALVE.

SPECIFICATION forming part of Letters Patent No. 233,662, dated October 26, 1880.

Application filed January 23, 1880.

To all whom it may concern:

Be it known that I, NELSON GURrIs, ot' N ewton, in the county of Middlesex and State ol Massachusetts, have invented certain new and useful Improvements in Valves, of which the following is a full and exact description, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which comprise a part of this specication.

Like letters refer to the same or corresponding parts in all the figures.

The nature of my invention relates to the construction of the valve with a suction, capillary, or current plug or prolongation of the valve in the exit-pipe, for the purpose of using the flow of the water, &c., beyond the valve, as a means for closing or helping to close the valve, so obviating the need of springs, 'extra weight, 85e., for that purpose; also, the provision of a frusto-conical portion, m, between said prolongation and the valve, performing the function of gradually closing off the area of ow into the exit-pipe, and also that of guiding the valve to its seat 5 also, the arrangement and combination of the secondary valve, valvelever, &c., the piston, valves, and parts, as hereinafter more fully set forth.

Figure l of the drawings is a sectional elevation of a stop-cock containing my improvements, the plane of section being coincident with the axes of the inlet and exit pipes. Fig. 2 is an elevation showing the exterior of a similar stop valve or cock. Fig. 3 is a plan of the valve-case. Fig. 4 is a plan of the secondary valve and its attached lever, which may be operated by a float or other means. Fig. 5 is a plan of the cap-piece p. Fig. 6 is a plan of the piston b. Fig. 7 is au under view of the valve with its piston b and prolongation d.

The valve c is connected to or is an attached part of piston b. The valve is of a smaller area than the piston b attached, which is a commonly-employed device when the main valve is to be opened and closed by the pressure under control of a secondary valve, wherebythe pressure is made to act above or below the piston with a preponderating force at pleasure. The peculiarities of this valve are as follows: It .is provided with the prolongation d, which extends along the exit-pipe@ and forms the escaping-current into a comparatively thin annular stream or current, which, by experiment, is found to exert a strong pull on the valve in the direction of its closing, probably byits friction upon the plug d. The prolongation d serves to enable the employment of a much greater movement of the valveA and consequent more gradual closing thereof or increase of the length of time occupied in closing.

By lengthening the chambery' space is secured for the increase movement. The frusto-conical part m, between the valve c and the parallel or straight prolongation d, serves as a guide iu 'seating the valve c, while it also graduates the iiow into the exit-pipe during the closing, and secures a gradually-decreasing flow till the valve closes entirely. The latter function guards against concussion or ha'mmen77 The valves c and g may close upon metal, leather, or any of the usual materials used for valve faces or seats.

In the drawings, my improvements are shown as applied to an automatic iioat closing-valve or stop-cock, but they are applicable to a variety of other uses, such as steam, Sto. The lever or valve g may be operated by various means.

The valve will operate for some purposes if the pipe e be made the inlet and a the outlet, thus reversing the flow. In such case a small passage will be made through the valve orl case to admit the pressure from pipe e to the chamber j.

The cap p or top on chamber j is provided with an exit-passage, f, communicating with the open air or tank, which is closed at pleasure or automatically, and opened in like manner by the valve g. A oat-lever may be connected to valve g, pivoted at h, as see i.

In case of automatic use by means of the float-levert', the operation is as follows, so far as understood from the practical working, which has proved very satisfactory: The inlet-pipe a being connected to the supply, and pipe e placed over or connected to a tank, which is to be kept filled to a given level, and the outer end of the lever t being connected to the float in the tank or cistern to be supplied, with the float resting on the sur- IOO face of the water or liquid in said tank. The tank being full the valve gis agreeably shown in closed position. When the level in the tank is depressed by being drawn from or otherwise7 the Heat falls and depresses the outer end of lever and opens valve g. This relieves the pressure in chamber j above the valve-piston b, when immediately the preponderance of pressure upon the opposite side of piston b causes it to move in the direction of j and open the valve c7 when the flow begins in the direction of the arrows through pipe a, the annular space k, and pipe e into the tank. When the level fixed upon is reached in the tank or cistern the oat lifts or has been lifted therewith and raises the outer end of lever t", and so closes the valve g, when immediately the pressure begins to return in chamber] by means of the leakage provided for in the looseness of piston b in chamber j, l, or other connecting-passage from the supply-chamber to chamber j. Then. as the pressure in j apl proaches equality with that in the supplycharnber the valve begins to close and gradually reaches the closed position7 the effective area of the piston on chamber j side being greater than on the opposite side This action is repeated whenever the level in the tank is again depressed.

The parts may be made of the materials usually employed in the art.

The valve g may be operated by various other means than the lioat method herein described.

The prolongation d, when arranged beyond the cone part m, away from the valve, as shown7 performs an important function, which cannot be performed by a similar cylindrical prolongation arranged between the valve c and the cone part oil-viz., that of more effectually drawing the valve to its scat when high up therefrom; also, in an earlier holding` back of the pressure partially in chambery' by its reduction of the discharge-current before the cone acts in closing to a thin annular stream.

I claiml. The valve c, constructed with the conical part m and prolongation d, in combination with the piston b, valve g, straight or parallel sided pipe e, chamber j, and pipe a, substantially as described and shown, and for the purpose set forth.

2. The valve c, constructed with-the conical part m and prolongation (fl, in combination with the straight or parallel sided pipe e, and piston b, substantially as described, and for the purpose set forth.

The valve c, constructed with the attached parts m and d in the order of arrange ment and in combination with the straight or parallel sided pipe c, substantially as shown and described. y

NELSON CURTIS.

Witnesses:

D. N. B. GoFFrN, LYsANDER BURNETT. 

